Abstract
Breast displacement of a female body during exercise might cause discomfort, breast pain and even other injury to breast tissue. The different design of sports bra in terms of materials and styles might have various effects on the breast support both in static and dynamic states. The purpose of this study is to develop a method to evaluate the mechanical function of sports bra, and investigate the material effect on it. The 3D breast displacements of six subjects in three conditions (bare, bra C with two cup shaped pads, and bra NC with the cup pads removed) were respectively recorded at five points including the left nipple and four surrounding points by using an 8-camera Vicon motion capturing system. The pressure at the five points was also measured by using air pack pressure sensors. The mechanical properties of bra materials were tested by using KES biaxial extension and compression testers. Wearing a bra obviously reduced breast displacements in three directions, bra C with an additional layer of the cup pad further slightly reduced the displacements while increasing pressure by about 0.2kPa. Both the biaxial tensile and compression properties of the materials need to be considered in sports bra design.
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